Answer:
Option A.
Explanation:
Option A. 3(x + 2) = 3x + 6
L.H.S. = R.H.S.
So equivalent expressions.
Option B. (3x + 2x) = 5x ≠ x² ( 3 + 2 )
Expressions are not equivalent L.H.S. ≠ R.H.S.
Option C. R.H.S. 3(x+2) = 3x + 6 ≠ L.H.S. (3x + 2)
Expression are not equivalent.
Option D. L.H.S. -3(2+x) = -6 -3x ≠ - 6x - 3 (R.H.S.)
Therefore, expressions are not equivalent.
Option A. is the answer.